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/*
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2012 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <Python.h>
#include "util/sss_python.h"
#include "util/murmurhash3.h"
PyDoc_STRVAR(murmurhash3_doc,
"murmurhash3(key, key_len, seed) -> 32bit integer hash\n\
\n\
Calculate the murmur hash version 3 of the first key_len bytes from key\n\
using the given seed."
);
static PyObject * py_murmurhash3(PyObject *module, PyObject *args)
{
const char *key;
long key_len;
long long seed;
uint32_t hash;
if (!PyArg_ParseTuple(args, sss_py_const_p(char, "slL"),
&key, &key_len, &seed)) {
PyErr_Format(PyExc_ValueError, "Invalid argument\n");
return NULL;
}
if (seed > UINT32_MAX || key_len > INT_MAX || key_len < 0 ||
key_len > strlen(key)) {
PyErr_Format(PyExc_ValueError, "Invalid value\n");
return NULL;
}
hash = murmurhash3(key, key_len, seed);
return PyLong_FromUnsignedLong((unsigned long) hash);
}
static PyMethodDef methods[] = {
{ sss_py_const_p(char, "murmurhash3"), (PyCFunction) py_murmurhash3,
METH_VARARGS, murmurhash3_doc },
{ NULL,NULL, 0, NULL }
};
PyMODINIT_FUNC
initpysss_murmur(void)
{
Py_InitModule3(sss_py_const_p(char, "pysss_murmur"),
methods, sss_py_const_p(char, "murmur hash functions"));
}
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